During the installation process, I had to tell the installer I had an AHA152x SCSI card to use its CD drive. The "autoprobe" option had no effect, and so I had to know that the magic option to use was (in my case) "aha152x=0x340,11". Creating a dialogue box which allows newbies to type in the IRQ and IO base required would be much more usable.
Documentation for module paramters that can be entered in the 'Specify Options' dialog window can be found in section E.2 of the Red Hat 6.0 Installation Guide.